what size alternator
My buddy has a 1972 pontiac Lemans with a 400 bored 30 over. His generator light comes on while driving. Is the alternator going bad? its still a 3 wire i think. What ampreage will he need?
I am by no means an expert but I do know that the alternator size requirement is a function of the amperage draw of the various electrical accessories on the car. That's the place to start. What's the max potential amp draw assuming likely accessories to be on at the same time?
Before looking for a higher amp alternator, I think I'd make sure the current one is doing what it's supposed to do. If your friend hasn't a clue about this stuff, then he'd probably be wise to seek some professional advice/troubleshooting.
According to my NAPA Prolink electronic catalog, there were 4 possible alternators on that year/make/model:
2 that were 55-63 Amp "small frame - 10SI" ... (1 with single groove, 1 with double groove pulley)
There were also 2, 80 Amp "large-frame - 27SI" alternators ... again offered in single and double groove pulley versions. These alternators had a 2-leg lower mount and were an "HD option" on these cars. They were usually on the well-equipped models with AC, power seats, rear defrost, etc.
Most Delco alternators have a Delco-Remy ID number stamped into the front half of the case along with the Amp rating. It is also common practice for rebuilders to grind these numbers off of a "rebuildable core" and affix their own identification label or tag according to the rebuild specs.
IF it is still there, it will be all numeric ... something like "1101015" followed by "80A"
I can help to idenify it further if that stamping info is still available, or you can browse the
Note that the Wilson catalog only list 1 of each series, because their alternators are not supplied with new pullies.
thanks guys, He's not running any high current audio system, just the factory stuff. He was asking me about remans and I was telling hime he couldnt wrong with an upgrade.
IF he has a 63 Amp (small-frame) alternator, a shop that specializes in electrical rebuilding could overhaul it and install a "Y-wound" stator for that 80+ Amp output.
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